PInvoke.net add-in for saves the effort of having to open up a web browser to search for the PInvoke.net website.
PInvoke.net, meaning Platform Invoke, is a wiki used by around 50,000 .NET developers a month to find and contribute PInvoke signatures (also known as Declare statements in VB), type definitions, and any other information related to calling Win32, or other unmanaged APIs in managed code (languages such as C# or VB.NET).